Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract receivables	$ 57,435	$ 58,881
Allowance for doubtful accounts	(3,110)	(2,582)
Total accounts receivable	63,046	68,434
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	$ 8,721	$ 12,135